1、首先在项目中导入jar包，我用的是mail-1.4.jar

2、一下是我的代码：

public class SendMailUtil {

private static final Logger logger = Logger.getLogger(SendMailUtil.class);

// 定义发件人、收件人、主题等

private String to = null;// 收件人邮箱地址

private String from = null;// 发件人邮箱地址

private String password = null;//发件人密码

private String host = null;//邮件服务器

private String filename = null;

// 用于保存发送附件的文件路径名的集合

private Vector fileList = new Vector();

/*

* 可以传发件人等参数的构造

*/

public SendMailUtil(String to, String from, String password,

String smtpServer) {

// 初始化发件人、收件人、主题等

this.to = to;

this.from = from;

this.password = password;

this.host = smtpServer;

}

/*

* 该方法用于收集附件名

*/

public void attachfile(String fname) {

fileList.addElement(fname);

}

/*

* 开始发送信件的方法

*/

public boolean startSend(String emailTitle, String emailContent) {

if (StringUtils.isBlank(emailContent)) {

logger.error("邮件内容不能为空！");

return false;

}

try {

if (StringUtils.isBlank(emailContent)) {

throw new NullPointerException("发送的内容不能为空！");

}

// 创建Properties对象

Properties props = System.getProperties();

// 创建信件服务器

props.put("mail.smtp.auth", "true");

props.put("mail.smtp.host", host);

props.put("mail.smtp.password", "0");

// 得到默认的对话对象

Session session = Session.getInstance(props,

new PopupAuthenticator(this.from, this.password));

// 创建一个消息，并初始化该消息的各项元素

MimeMessage msg = new MimeMessage(session);

msg.setFrom(new InternetAddress(from));

InternetAddress[] address = { new InternetAddress(to) };

msg.setRecipients(Message.RecipientType.TO, address);

// getBytes("ISO-8859-1")

// String title=new String(emailTitle.getBytes("ISO-8859-1"),"GBK");

msg.setSubject(emailTitle);

// 后面的BodyPart将加入到此处创建的Multipart中

Multipart mp = new MimeMultipart("subtype");

// 添加HTML正文

BodyPart htmlBody = new MimeBodyPart();

MimeMultipart htmlContent = new MimeMultipart("related");

BodyPart msgContent = new MimeBodyPart();

htmlContent.addBodyPart(msgContent);

msgContent.setContent(emailContent, "text/html;charset=utf-8");

htmlBody.setContent(htmlContent);

mp.addBodyPart(htmlBody);

// 利用枚举器方便的遍历集合

Enumeration efile = fileList.elements();

// 检查序列中是否还有更多的对象

while (efile.hasMoreElements()) {

MimeBodyPart mbp = new MimeBodyPart();

// 选择出每一个附件名

filename = efile.nextElement().toString();

// 得到数据源

FileDataSource fds = new FileDataSource(filename);

// 得到附件本身并至入BodyPart

mbp.setDataHandler(new DataHandler(fds));

// 得到文件名同样至入BodyPart

mbp.setFileName(fds.getName());

mp.addBodyPart(mbp);

}

// 移走集合中的所有元素

fileList.removeAllElements();

// Multipart加入到信件

msg.setContent(mp);

// 设置信件头的发送日期

msg.setSentDate(new Date());

// 发送信件

Transport.send(msg);

} catch (Exception e) {

e.printStackTrace();

return false;

}

return true;

}

// 认证类

class PopupAuthenticator extends Authenticator {

private String username ;

private String password ;

public PopupAuthenticator(String user, String pass) {

this.username = user;

this.password = pass;

}

protected PasswordAuthentication getPasswordAuthentication() {

return new PasswordAuthentication(username, password);

}

}

//测试

public static void main(String[] args) {

SendMailUtil mail = new SendMailUtil("[email protected]",

"[email protected]","123456", "smtp.163.com");

mail.attachfile("C:\\Users\\awen\\Desktop\\a.txt");

mail.startSend("交接文档","收到请回复");

System.out.println("邮件发送完成...");

}

3、测试成功，大家可以试一下。

原文：http://my.oschina.net/u/1453975/blog/318528